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@ARTICLE{Maddison:28021,
      author       = {Maddison, G. P. and Brix, M. and Budny, R. and Charlet, M.
                      and Coffey, I. H. and Cordey, J. G. and Dumortier, P. and
                      Erents, S. K. and Hawkes, N. C. and von Hellermann, M. and
                      Hillis, D. L. and Hogan, J. and Horton, L. D. and Ingesson,
                      L. C. and Jachmich, S. and Jackson, G. L. and Kallenbach, A.
                      and Koslowski, H. R. and Lawson, K. D. and Loarte, A. and
                      Matthews, G. F. and McKee, G. R. and Meigs, A. G. and
                      Messiaen, A. M. and Milani, F. and Monier-Garbet, P. and
                      Murakami, M. and Nave, M. F. F. and Ongena, J. and Puiatti,
                      M. E. and Rachlew, E. and Rapp, J. and Sharapov, S. and
                      Staebler, G. M. and Stamp, M. and Strachan, J. D. and
                      Telesca, V. M. and Tokar, M. Z. and Unterberg, B. and
                      Valisa, M. and Zastrow, S. A.},
      title        = {{I}mpurity-seeded plasma experiments on {JET}},
      journal      = {Nuclear fusion},
      volume       = {43},
      issn         = {0029-5515},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {PreJuSER-28021},
      pages        = {49 - 62},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Scaling to larger tokamaks of high confinement plasmas with
                      radiating edges, induced by impurities, is being studied
                      through internationally collaborative experiments on JET. In
                      campaigns till the end of 2000, three different regimes have
                      been explored. A small number of limiter L-mode discharges
                      seeded with neon have most closely repeated the approach
                      used on TEXTOR-94, but different collisionality and particle
                      transport in JET impede central peaking of the density
                      associated with improved confinement. Divertor L-modes at
                      intermediate density, again with neon injection, have
                      pursued transiently enhanced states found on DIII-D.
                      Confinement up to H-mode quality, together with radiation
                      fractions of approximate $to40\%,$ have briefly been
                      obtained, though central Z(eff) quickly increases. Most
                      effectively, neon and argon seeding of higher density ELMy
                      H-modes formed mainly at low triangularity on the septum of
                      the MkIIGB divertor, resembling a pumped-limiter
                      arrangement, have been examined. Good confinement has been
                      sustained at densities close to the Greenwald level in
                      'afterpuff' (AP) phases following the end of main gas
                      fuelling, for little change of central Z(eff) but up to
                      approximate $to60\%$ radiation. Outstanding normalized
                      properties up to H-97 = 0.99 at f(Gwd) = 0.94 have thus been
                      achieved, above the conventional H-mode density limit for
                      diverted plasmas. Stationarity of states has also been
                      extended to many energy confinement times by including low,
                      extra gas inputs in the 'AP', suggestive of an optimized
                      fuelling scheme. Further development in 2001 is reported
                      separately in [1]. Accompanying ELMs are generally reduced
                      in frequency though not evidently in size, electron pedestal
                      pressure being almost unchanged from unseeded behaviour.
                      There are indications of the most favourable impurity
                      species scaling with plasma parameters, performance,
                      radiation and its concentration within a mantle all
                      increasing with argon compared to neon in JET. These
                      benefits in terms of integrated properties are just as
                      required for long burning pulses in ITER, supporting its use
                      of a radiating mantle to assist not only power exhaust but
                      performance too. Impurity-seeded H-modes can therefore
                      contribute directly to next-step scenario development.},
      keywords     = {J (WoSType)},
      cin          = {IPP},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB181},
      pnm          = {Kernfusion und Plasmaforschung},
      pid          = {G:(DE-Juel1)FUEK250},
      shelfmark    = {Physics, Fluids $\&$ Plasmas / Physics, Nuclear},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000180953100006},
      doi          = {10.1088/0029-5515/43/1/306},
      url          = {https://juser.fz-juelich.de/record/28021},
}